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Temporal Trends of C8–C36 Chlorinated Paraffins in Swedish Coastal Sediment Cores over the Past 80 Years
- Yuan, Bo, Brüchert, Volker, Sobek, Anna, de Wit, Cynthia A.
- Environmental science & technology 2017 v.51 no.24 pp. 14199-14208
- alkanes, coastal sediments, coasts, sewage treatment, statistics, steel, Baltic Sea, Sweden
- Temporal trends of chlorinated paraffins (CPs) were analyzed in three sediment cores collected near different potential CP sources along the Swedish Baltic Sea coast. C₈–C₃₆ CPs were found in sediment dating back to the 1930s. The maximum CP concentrations found in proximity to a metropolitan sewage treatment plant, a wood-related industrial area, and a steel factory were 48, 160, and 1400 ng/g d.w., respectively, in sediment sections dated from the early 1990s or the 2000s. The temporal trends agree with statistics on CP importation in Sweden or local industrial activities. MCCPs (C₁₄–C₁₇ CPs) and LCCPs (C≥₁₈ CPs) predominated in most sediments with average percentage compositions of 47 ± 20% and 37 ± 20%, respectively. Concentrations of SCCPs in the three cores showed a decreasing trend in recent years. The temporal trends of MCCPs indicated that these are currently the predominant CPs in use. This study showed for the first time that LCCPs from C₁₈ to C₃₆, as well as C₈–C₁₇ CPs, are persistent in sediments over the last 50–80 years, indicating that CPs are persistent chemicals regardless of alkane-chain lengths.